Various Types Of Tests Done At Our Laboratory

Type of Tests Purpose of the Test  
Cube Test Sample cubes of concrete are taken from every site and cured for 28 days. The respective cubes are tested using compressive testing machine to find the strength of concrete on 7th and 28th days respectively. The testing can also be done in the presence of customer at our in house laboratory .
Slump Test

It measures the consistency of a concrete mix or its stiffness. A conical mould is filled with fresh concrete in 3 stages & rammed with a standard rod. The mould is lifted without disturbing the cone. The subsidence of the concrete from the height of the cone is measured to the nearest 5cm. The testing can also be done in the presence of customer at our in house laboratory. The tests is done in the presence of the customer at the delivery site Low slump test results lower workability.

Silt content test Is to find the silt content of manufactured sand that is used as raw material for making concrete Silt is granular material of a size between sand and clay. Presence of silt in aggregates result in increased shrinkage or permeability, In addition to poor bonding.
Sieve Analysis This test is carried to determine the particle size distribution in a sample of fine and coarse aggregates. Fineness modulus of the material is calculated,sand having F.M>3.2 is unsuitable.
Specific Gravity To find the specific gravity of fine and course aggregates by pycnometer. It is considered to be a measure of strength or quality of material .It is also required for workability measurements
Water Absorption Water absorption gives an idea about strength of aggregates. Aggregates having more water absorption are more porous in nature, resulting in higher workability and are generally considered unsuitable for concrete.
Moisture Test It is to find the amount of water present in sand by using hot air oven it is necessary to find the moisture content of sand as it varies depending on the supplier ,climatic conditions etc and is an important factor of the quality of concrete produced. So with respect to the moisture test result the water added during the batching of concrete is regulated to obtain a uniform mix .
Impact Test Resistance of the aggregate to failure by impact is tested by the impacting testing machine. The ratio of fines(finer than 2.36mm) to the total weight of a sample is the Aggregate impact value. The Aggregate Impact value is kept as specified in IS 283:1970.
Elongation And Flakiness Test This test is to check the shape of coarse aggregates by using length and thickness gauge. If the shape of aggregates used in concrete is not rounded or cubical the interlocking of aggregates in concrete will not be proper and strength of concrete will decrease. We make sure that the coarse aggregates are round in shape and uniform in size so as to get a quality mix.
Air Entrainment Meter Test Is to determine the air content of compacted fresh concrete which is a very important parameter for the behavior of concrete to weathering and to verify the air content variation due to the use of chemical additives to increase the workability of concrete.